ThinkNode M7 (#8077)

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* ThinkNode G3, ETH support WIP

* rename variant and add guard macros

* older G3 operational. M7 next.

* Split out G3 and M7 to different variants. Completely new PCB design. The G3 stays on 'PRIVATE_HW'

* Define button behaviour and use all of the device flash

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: caveman99 <25002+caveman99@users.noreply.github.com>
Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>

src/modules/AdminModule.cpp

@@ -1318,7 +1318,7 @@ void AdminModule::handleGetDeviceConnectionStatus(const meshtastic_MeshPacket &r
     }
 #endif
 
-#if HAS_ETHERNET && !defined(USE_WS5500)
+#if HAS_ETHERNET && !defined(USE_WS5500) && !defined(USE_CH390D)
     conn.has_ethernet = true;
     conn.ethernet.has_status = true;
     if (Ethernet.linkStatus() == LinkON) {